Question
What is the secondary structure of proteins?
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Answer
The secondary structure of proteins arises due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between 
and -NH group of the peptide bond.
and -NH group of the peptide bond.Need a full question paper?
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How do you convert:
- Chlorobenzene to biphenyl.
- Propene to I-iodopropane.
- 2-bromobutane to but-2-ene.
[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.
In the following cases rearrange the compounds as directed:
- In an increasing order of basic strength:
C6H5NH2, C6H5N(CH3)2, (C2H5)6NH and CH3NH2.
- In a decreasing order of basic strength:
Aniline, p-nitroaniline and p-toluidine.
- In an increasing order of pKb values:
C2H5NH2, C6H5 NHCH3, (C2H5)2NH and C6H5NH2.
Carbonyl group is present in carboxylic acids and their derivatives, yet they do not show the properties of carboxylic group, why?
Give reasons:
- Acetylation of aniline reduces its activation effect.
- CH3NH2 is more basic than C6H5NH2.
- Although –NH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.
Answer the following questions on the basis of the given plot of potential energy vs reaction coordinate:
- What is the threshold energy for the reaction?
- What is the activation energy for forward reaction?
- What is the activation energy for backward reaction?
- What is enthalpy change for the forward reaction?
Answer the following questions:
An optically active compound having molecular formula C7H15Br reacts with aqueous KOH to give a racemic mixture of products. Write the mechanism involved in this reaction.
An optically active compound having molecular formula C7H15Br reacts with aqueous KOH to give a racemic mixture of products. Write the mechanism involved in this reaction.
Write the Nernst equation and emf of the following cells at 298 K:
Mg(s) | Mg2+(0.001M) || Cu2+(0.0001 M) | Cu(s)
Mg(s) | Mg2+(0.001M) || Cu2+(0.0001 M) | Cu(s)
Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.
Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal, pchloroform, and pacetone as a function of xacetone. The experimental data observed for different compositions of mixture is:
Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
| 100 x xacetone | 0 | 11.8 | 23.4 | 36.0 | 50.8 | 58.2 | 64.5 | 72.1 |
| pacetone/ mm Hg | 0 | 54.9 | 110.1 | 202.4 | 322.7 | 405.9 | 454.1 | 521.1 |
| pchloroform/ mm Hg | 632.8 | 548.1 | 469.4 | 359.7 | 257.7 | 193.6 | 161.2 | 120.7 |